dockerfile: fix busybox in debug docker image (#1581)
dockerfile: fix busybox in debug docker image (#1581)

ls failed on the debug docker images with the following message:

```
$ ls
ls: can't open '.': Value too large for defined data type
```

This patch changes the Busybox version to Glibc and bumps it
from 1.30.0 to 1.31.0.

Upstream issues:

- https://github.com/GoogleContainerTools/distroless/issues/225
- https://bugs.busybox.net/show_bug.cgi?id=11651

Signed-off-by: Mario Marín <864c767f070ada8d8e7fa07abee550894d91ca3d@gmail.com>
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